What is a good workflow between blender and 3d coat?
I also use 3D Coat, the built in AddOn helps a lot. You have to go into preferences and enable it.
My workflow is: Sculpt Highpoly in 3DCoat, retopo and lowpoly in 3DCoat, Exporting Highpoly and transfering the lowpoly to Blender for unwraping, after that just baking in xNormal.